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Stockholders' Equity And Benefit Plans (Schedule Of Restricted Stock And Restricted Stock Unit Activity) (Details) (USD $)
Share data in Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Stockholders' Equity And Benefit Plans [Abstract]  
Nonvested at December 31, 2011, Number of Shares 352
Granted, Number of Shares 62
Vested, Number of Shares (138)
Forfeited, Number of Shares (7)
Nonvested at March 31, 2012, Number of Shares 269
Expected to vest, Number of Shares 243
Nonvested at December 31, 2011, Weighted-Average Grant-Date Fair Value $ 45.70
Granted, Weighted-Average Grant-Date Fair Value $ 127.66
Vested, Weighted-Average Grant-Date Fair Value $ 41.26
Forfeited, Weighted-Average Grant-Date Fair Value $ 54.34
Nonvested at March 31, 2012, Weighted-Average Grant-Date Fair Value $ 66.60
Expected to vest, Weighted-Average Grant-Date Fair Value $ 66.60
Fair value of restricted stock and restricted stock units, vested $ 17,400,000